In ("The Corps is Mother, the Corps is Father") the bartender mentions having seen an alien with eight compound eyes knocked completely unconscious for two full hours by just two fingers of gin, after which he wanted to do it again. Though the species isn't named, it's possible this is intended as a reference to the Vinzini since the other races seen with compound eyes (Gaim, Cascor & N'Grath's Race) only have two eyes, not eight. On the other hand it's equally possible that this is meant to be an entirely separate species.